I have fatal error in RoutingMiddleware.php** on line **93**

Fatal error : Uncaught Slim\Exception\HttpNotFoundException: Not found. in C:\xampp\htdocs\ss\vendor\slim\slim\Slim\Middleware\RoutingMiddleware.php:93 Stack trace: #0 C:\xampp\htdocs\ss\vendor\slim\slim\Slim\Routing\RouteRunner.php(72): Slim\Middleware\RoutingMiddleware->performRouting(Object(Slim\Psr7\Request)) #1 C:\xampp\htdocs\ss\vendor\slim\slim\Slim\MiddlewareDispatcher.php(81): Slim\Routing\RouteRunner->handle(Object(Slim\Psr7\Request)) #2 C:\xampp\htdocs\ss\vendor\slim\slim\Slim\App.php(215): Slim\MiddlewareDispatcher->handle(Object(Slim\Psr7\Request)) #3 C:\xampp\htdocs\ss\vendor\slim\slim\Slim\App.php(199): Slim\App->handle(Object(Slim\Psr7\Request)) #4 C:\xampp\htdocs\ss\public\index.php(16): Slim\App->run() #5 {main} thrown in C:\xampp\htdocs\ss\vendor\slim\slim\Slim\Middleware\RoutingMiddleware.php on line 93

If your Slim Framework application does not have a route that matches the current HTTP request URI, the application returns a HTTP/1.1 404 Not Found response to the HTTP client.

where i can write me default url?

Have you tried to read the docs? http://www.slimframework.com/docs/v4/